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Issues deploying security filters in Jboss AS 5.1.ga

If im using spring security framework in Jboss AS 5.1 im getting following error

17:01:33,465 ERROR [[default]] Servlet.service() for servlet default threw exception
java.lang.IllegalArgumentException: Can only process HttpServletRequest
at org.springframework.security.intercept.web.FilterI nvocation.<init>(FilterInvocation.java:53)
at org.springframework.security.util.FilterChainProxy .doFilter(FilterChainProxy.java:160)
at org.springframework.web.filter.DelegatingFilterPro xy.invokeDelegate(DelegatingFilterProxy.java:236)
at org.springframework.web.filter.DelegatingFilterPro xy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doF ilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationV alve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.inv oke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstab lishmentValve.process(SecurityContextEstablishment Valve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstab lishmentValve.invoke(SecurityContextEstablishmentV alve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionV alve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

Im not sure what went wrong here. it was working fine before i just added a new servlet(the only servlet) in the application and it started throwing the above error? did any one faced similar issues before? im using Spring Security 2.0.4